Personally, I might suggest the Doepfer module just because you did get rid of the Vermona LFO and this might be a good way to cover some of that function while also having envelope functionality and a few other things. However, this is more subjective territory now, and if you just like the idea of Maths more, it will also be really good in here.
The best bet here is just to buy the one you like the idea of the most and sell it if it doesn't work. Forming a preference around these will depend on trying them out. Personally, I own a Tiptop 281t, so I'm more used to the Doepfer module and its style and I coild be biased (it's very similar to the Buchla one).